Now we begin to understand the origin of our current understanding of the nature of light. We learn about the progress of both the particle and wave explanations of light through history. • Early Light Concepts: Ancient philosophers like Euclid and Ptolemy thought of light as particles due to its reflection and refraction properties. • Refraction Discovery: Ptolemy discovered the relationship between the angles of incidence and refraction, explaining phenomena like the apparent bending of objects in water. • Source of Light: Alhazen discovered that light is received by the eye, not emitted from it, debunking the ancient misconception that vision involves light emanating from the eyes. • Rainbow Formation: Rainbows are formed by the refraction of light through water droplets in the sky. • Theodorakis’s Experiment: Demonstrated how rainbows are formed by the refraction of light through water droplets. • Light’s Nature: Exhibits both particle-like and wave-like properties.